redonkable/alistair23-linux
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drm/nv50: rework PGPIO IRQ handling and hotplug detection

Browse source 
Allows callers to install their own handlers for when a GPIO line
changes state (such as for hotplug detect).

This also fixes a bug where we weren't acknowledging the GPIO IRQ
until after the bottom half had run, causing a severe IRQ storm
in some cases.

Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-11-11 16:14:56 +10:00
parent e4cbadcaaa
commit fce2bad0ee
7 changed files with 235 additions and 105 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

54
drivers/gpu/drm/nouveau/nouveau_connector.c
View file

@ -37,6 +37,8 @@
#include "nouveau_connector.h"
#include "nouveau_hw.h"
static void nouveau_connector_hotplug(void *, int);
static struct nouveau_encoder *
find_encoder_by_type(struct drm_connector *connector, int type)
{
@ -94,22 +96,30 @@ nouveau_connector_bpp(struct drm_connector *connector)
}
static void
nouveau_connector_destroy(struct drm_connector *drm_connector)
nouveau_connector_destroy(struct drm_connector *connector)
{
struct nouveau_connector *nv_connector =
nouveau_connector(drm_connector);
struct nouveau_connector *nv_connector = nouveau_connector(connector);
struct drm_nouveau_private *dev_priv;
struct nouveau_gpio_engine *pgpio;
struct drm_device *dev;
if (!nv_connector)
return;
dev = nv_connector->base.dev;
dev_priv = dev->dev_private;
NV_DEBUG_KMS(dev, "\n");
pgpio = &dev_priv->engine.gpio;
if (pgpio->irq_unregister) {
pgpio->irq_unregister(dev, nv_connector->dcb->gpio_tag,
nouveau_connector_hotplug, connector);
}
kfree(nv_connector->edid);
drm_sysfs_connector_remove(drm_connector);
drm_connector_cleanup(drm_connector);
kfree(drm_connector);
drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
static struct nouveau_i2c_chan *
@ -760,6 +770,7 @@ nouveau_connector_create(struct drm_device *dev, int index)
{
const struct drm_connector_funcs *funcs = &nouveau_connector_funcs;
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
struct nouveau_connector *nv_connector = NULL;
struct dcb_connector_table_entry *dcb = NULL;
struct drm_connector *connector;
@ -876,6 +887,11 @@ nouveau_connector_create(struct drm_device *dev, int index)
break;
}
if (pgpio->irq_register) {
pgpio->irq_register(dev, nv_connector->dcb->gpio_tag,
nouveau_connector_hotplug, connector);
}
drm_sysfs_connector_add(connector);
dcb->drm = connector;
return dcb->drm;
@ -886,3 +902,29 @@ fail:
return ERR_PTR(ret);
}
static void
nouveau_connector_hotplug(void *data, int plugged)
{
struct drm_connector *connector = data;
struct drm_device *dev = connector->dev;
NV_INFO(dev, "%splugged %s\n", plugged ? "" : "un",
drm_get_connector_name(connector));
if (connector->encoder && connector->encoder->crtc &&
connector->encoder->crtc->enabled) {
struct nouveau_encoder *nv_encoder = nouveau_encoder(connector->encoder);
struct drm_encoder_helper_funcs *helper =
connector->encoder->helper_private;
if (nv_encoder->dcb->type == OUTPUT_DP) {
if (plugged)
helper->dpms(connector->encoder, DRM_MODE_DPMS_ON);
else
helper->dpms(connector->encoder, DRM_MODE_DPMS_OFF);
}
}
drm_helper_hpd_irq_event(dev);
}

6
drivers/gpu/drm/nouveau/nouveau_dp.c
View file

@ -279,7 +279,7 @@ nouveau_dp_link_train(struct drm_encoder *encoder)
struct bit_displayport_encoder_table *dpe;
int dpe_headerlen;
uint8_t config[4], status[3];
bool cr_done, cr_max_vs, eq_done;
bool cr_done, cr_max_vs, eq_done, hpd_state;
int ret = 0, i, tries, voltage;
NV_DEBUG_KMS(dev, "link training!!\n");
@ -297,7 +297,7 @@ nouveau_dp_link_train(struct drm_encoder *encoder)
/* disable hotplug detect, this flips around on some panels during
* link training.
*/
pgpio->irq_enable(dev, nv_connector->dcb->gpio_tag, false);
hpd_state = pgpio->irq_enable(dev, nv_connector->dcb->gpio_tag, false);
if (dpe->script0) {
NV_DEBUG_KMS(dev, "SOR-%d: running DP script 0\n", nv_encoder->or);
@ -439,7 +439,7 @@ stop:
}
/* re-enable hotplug detect */
pgpio->irq_enable(dev, nv_connector->dcb->gpio_tag, true);
pgpio->irq_enable(dev, nv_connector->dcb->gpio_tag, hpd_state);
return eq_done;
}

21
drivers/gpu/drm/nouveau/nouveau_drv.h
View file

@ -376,13 +376,19 @@ struct nouveau_display_engine {
};
struct nouveau_gpio_engine {
void *priv;
int (*init)(struct drm_device *);
void (*takedown)(struct drm_device *);
int (*get)(struct drm_device *, enum dcb_gpio_tag);
int (*set)(struct drm_device *, enum dcb_gpio_tag, int state);
void (*irq_enable)(struct drm_device *, enum dcb_gpio_tag, bool on);
int (*irq_register)(struct drm_device *, enum dcb_gpio_tag,
void (*)(void *, int), void *);
void (*irq_unregister)(struct drm_device *, enum dcb_gpio_tag,
void (*)(void *, int), void *);
bool (*irq_enable)(struct drm_device *, enum dcb_gpio_tag, bool on);
};
struct nouveau_pm_voltage_level {
@ -619,13 +625,6 @@ struct drm_nouveau_private {
bool msi_enabled;
struct workqueue_struct *wq;
struct work_struct irq_work;
struct work_struct hpd_work;
struct {
spinlock_t lock;
uint32_t hpd0_bits;
uint32_t hpd1_bits;
} hpd_state;
struct list_head vbl_waiting;
@ -1366,7 +1365,11 @@ int nv50_gpio_init(struct drm_device *dev);
void nv50_gpio_fini(struct drm_device *dev);
int nv50_gpio_get(struct drm_device *dev, enum dcb_gpio_tag tag);
int nv50_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state);
void nv50_gpio_irq_enable(struct drm_device *, enum dcb_gpio_tag, bool on);
int nv50_gpio_irq_register(struct drm_device *, enum dcb_gpio_tag,
void (*)(void *, int), void *);
void nv50_gpio_irq_unregister(struct drm_device *, enum dcb_gpio_tag,
void (*)(void *, int), void *);
bool nv50_gpio_irq_enable(struct drm_device *, enum dcb_gpio_tag, bool on);
/* nv50_calc. */
int nv50_calc_pll(struct drm_device *, struct pll_lims *, int clk,

4
drivers/gpu/drm/nouveau/nouveau_state.c
View file

@ -396,6 +396,8 @@ static int nouveau_init_engine_ptrs(struct drm_device *dev)
engine->gpio.takedown = nv50_gpio_fini;
engine->gpio.get = nv50_gpio_get;
engine->gpio.set = nv50_gpio_set;
engine->gpio.irq_register = nv50_gpio_irq_register;
engine->gpio.irq_unregister = nv50_gpio_irq_unregister;
engine->gpio.irq_enable = nv50_gpio_irq_enable;
switch (dev_priv->chipset) {
case 0x84:
@ -487,6 +489,8 @@ static int nouveau_init_engine_ptrs(struct drm_device *dev)
engine->gpio.takedown = nouveau_stub_takedown;
engine->gpio.get = nv50_gpio_get;
engine->gpio.set = nv50_gpio_set;
engine->gpio.irq_register = nv50_gpio_irq_register;
engine->gpio.irq_unregister = nv50_gpio_irq_unregister;
engine->gpio.irq_enable = nv50_gpio_irq_enable;
engine->crypt.init = nouveau_stub_init;
engine->crypt.takedown = nouveau_stub_takedown;

66
drivers/gpu/drm/nouveau/nv50_display.c
View file

@ -804,71 +804,6 @@ nv50_display_error_handler(struct drm_device *dev)
}
}
void
nv50_display_irq_hotplug_bh(struct work_struct *work)
{
struct drm_nouveau_private *dev_priv =
container_of(work, struct drm_nouveau_private, hpd_work);
struct drm_device *dev = dev_priv->dev;
struct drm_connector *connector;
const uint32_t gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 };
uint32_t unplug_mask, plug_mask, change_mask;
uint32_t hpd0, hpd1;
spin_lock_irq(&dev_priv->hpd_state.lock);
hpd0 = dev_priv->hpd_state.hpd0_bits;
dev_priv->hpd_state.hpd0_bits = 0;
hpd1 = dev_priv->hpd_state.hpd1_bits;
dev_priv->hpd_state.hpd1_bits = 0;
spin_unlock_irq(&dev_priv->hpd_state.lock);
hpd0 &= nv_rd32(dev, 0xe050);
if (dev_priv->chipset >= 0x90)
hpd1 &= nv_rd32(dev, 0xe070);
plug_mask = (hpd0 & 0x0000ffff) | (hpd1 << 16);
unplug_mask = (hpd0 >> 16) | (hpd1 & 0xffff0000);
change_mask = plug_mask | unplug_mask;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
struct drm_encoder_helper_funcs *helper;
struct nouveau_connector *nv_connector =
nouveau_connector(connector);
struct nouveau_encoder *nv_encoder;
struct dcb_gpio_entry *gpio;
uint32_t reg;
bool plugged;
if (!nv_connector->dcb)
continue;
gpio = nouveau_bios_gpio_entry(dev, nv_connector->dcb->gpio_tag);
if (!gpio || !(change_mask & (1 << gpio->line)))
continue;
reg = nv_rd32(dev, gpio_reg[gpio->line >> 3]);
plugged = !!(reg & (4 << ((gpio->line & 7) << 2)));
NV_INFO(dev, "%splugged %s\n", plugged ? "" : "un",
drm_get_connector_name(connector)) ;
if (!connector->encoder || !connector->encoder->crtc ||
!connector->encoder->crtc->enabled)
continue;
nv_encoder = nouveau_encoder(connector->encoder);
helper = connector->encoder->helper_private;
if (nv_encoder->dcb->type != OUTPUT_DP)
continue;
if (plugged)
helper->dpms(connector->encoder, DRM_MODE_DPMS_ON);
else
helper->dpms(connector->encoder, DRM_MODE_DPMS_OFF);
}
drm_helper_hpd_irq_event(dev);
}
static void
nv50_display_isr(struct drm_device *dev)
{
@ -918,4 +853,3 @@ nv50_display_isr(struct drm_device *dev)
}
}
}

1
drivers/gpu/drm/nouveau/nv50_display.h
View file

@ -36,7 +36,6 @@
#include "nv50_evo.h"
void nv50_display_irq_handler_bh(struct work_struct *work);
void nv50_display_irq_hotplug_bh(struct work_struct *work);
int nv50_display_early_init(struct drm_device *dev);
void nv50_display_late_takedown(struct drm_device *dev);
int nv50_display_create(struct drm_device *dev);

188
drivers/gpu/drm/nouveau/nv50_gpio.c
View file

@ -29,6 +29,24 @@
#include "nv50_display.h"
static void nv50_gpio_isr(struct drm_device *dev);
static void nv50_gpio_isr_bh(struct work_struct *work);
struct nv50_gpio_priv {
struct list_head handlers;
spinlock_t lock;
};
struct nv50_gpio_handler {
struct drm_device *dev;
struct list_head head;
struct work_struct work;
bool inhibit;
struct dcb_gpio_entry *gpio;
void (*handler)(void *data, int state);
void *data;
};
static int
nv50_gpio_location(struct dcb_gpio_entry *gpio, uint32_t *reg, uint32_t *shift)
@ -79,29 +97,123 @@ nv50_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state)
return 0;
}
int
nv50_gpio_irq_register(struct drm_device *dev, enum dcb_gpio_tag tag,
void (*handler)(void *, int), void *data)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
struct nv50_gpio_priv *priv = pgpio->priv;
struct nv50_gpio_handler *gpioh;
struct dcb_gpio_entry *gpio;
unsigned long flags;
gpio = nouveau_bios_gpio_entry(dev, tag);
if (!gpio)
return -ENOENT;
gpioh = kzalloc(sizeof(*gpioh), GFP_KERNEL);
if (!gpioh)
return -ENOMEM;
INIT_WORK(&gpioh->work, nv50_gpio_isr_bh);
gpioh->dev = dev;
gpioh->gpio = gpio;
gpioh->handler = handler;
gpioh->data = data;
spin_lock_irqsave(&priv->lock, flags);
list_add(&gpioh->head, &priv->handlers);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
void
nv50_gpio_irq_unregister(struct drm_device *dev, enum dcb_gpio_tag tag,
void (*handler)(void *, int), void *data)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
struct nv50_gpio_priv *priv = pgpio->priv;
struct nv50_gpio_handler *gpioh, *tmp;
struct dcb_gpio_entry *gpio;
unsigned long flags;
gpio = nouveau_bios_gpio_entry(dev, tag);
if (!gpio)
return;
spin_lock_irqsave(&priv->lock, flags);
list_for_each_entry_safe(gpioh, tmp, &priv->handlers, head) {
if (gpioh->gpio != gpio ||
gpioh->handler != handler ||
gpioh->data != data)
continue;
list_del(&gpioh->head);
kfree(gpioh);
}
spin_unlock_irqrestore(&priv->lock, flags);
}
bool
nv50_gpio_irq_enable(struct drm_device *dev, enum dcb_gpio_tag tag, bool on)
{
struct dcb_gpio_entry *gpio;
u32 reg, mask;
gpio = nouveau_bios_gpio_entry(dev, tag);
if (!gpio) {
NV_ERROR(dev, "gpio tag 0x%02x not found\n", tag);
return;
}
if (!gpio)
return false;
reg = gpio->line < 16 ? 0xe050 : 0xe070;
mask = 0x00010001 << (gpio->line & 0xf);
nv_wr32(dev, reg + 4, mask);
nv_mask(dev, reg + 0, mask, on ? mask : 0);
reg = nv_mask(dev, reg + 0, mask, on ? mask : 0);
return (reg & mask) == mask;
}
static int
nv50_gpio_create(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
struct nv50_gpio_priv *priv;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
INIT_LIST_HEAD(&priv->handlers);
spin_lock_init(&priv->lock);
pgpio->priv = priv;
return 0;
}
static void
nv50_gpio_destroy(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
kfree(pgpio->priv);
pgpio->priv = NULL;
}
int
nv50_gpio_init(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
struct nv50_gpio_priv *priv;
int ret;
if (!pgpio->priv) {
ret = nv50_gpio_create(dev);
if (ret)
return ret;
}
priv = pgpio->priv;
/* disable, and ack any pending gpio interrupts */
nv_wr32(dev, 0xe050, 0x00000000);
@ -111,8 +223,6 @@ nv50_gpio_init(struct drm_device *dev)
nv_wr32(dev, 0xe074, 0xffffffff);
}
INIT_WORK(&dev_priv->hpd_work, nv50_display_irq_hotplug_bh);
spin_lock_init(&dev_priv->hpd_state.lock);
nouveau_irq_register(dev, 21, nv50_gpio_isr);
return 0;
}
@ -126,26 +236,64 @@ nv50_gpio_fini(struct drm_device *dev)
if (dev_priv->chipset >= 0x90)
nv_wr32(dev, 0xe070, 0x00000000);
nouveau_irq_unregister(dev, 21);
nv50_gpio_destroy(dev);
}
static void
nv50_gpio_isr_bh(struct work_struct *work)
{
struct nv50_gpio_handler *gpioh =
container_of(work, struct nv50_gpio_handler, work);
struct drm_nouveau_private *dev_priv = gpioh->dev->dev_private;
struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
struct nv50_gpio_priv *priv = pgpio->priv;
unsigned long flags;
int state;
state = pgpio->get(gpioh->dev, gpioh->gpio->tag);
if (state < 0)
return;
gpioh->handler(gpioh->data, state);
spin_lock_irqsave(&priv->lock, flags);
gpioh->inhibit = false;
spin_unlock_irqrestore(&priv->lock, flags);
}
static void
nv50_gpio_isr(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
uint32_t hpd0_bits, hpd1_bits = 0;
struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
struct nv50_gpio_priv *priv = pgpio->priv;
struct nv50_gpio_handler *gpioh;
u32 intr0, intr1 = 0;
u32 hi, lo, ch;
hpd0_bits = nv_rd32(dev, 0xe054);
nv_wr32(dev, 0xe054, hpd0_bits);
intr0 = nv_rd32(dev, 0xe054) & nv_rd32(dev, 0xe050);
if (dev_priv->chipset >= 0x90)
intr1 = nv_rd32(dev, 0xe074) & nv_rd32(dev, 0xe070);
if (dev_priv->chipset >= 0x90) {
hpd1_bits = nv_rd32(dev, 0xe074);
nv_wr32(dev, 0xe074, hpd1_bits);
hi = (intr0 & 0x0000ffff) | (intr1 << 16);
lo = (intr0 >> 16) | (intr1 & 0xffff0000);
ch = hi | lo;
nv_wr32(dev, 0xe054, intr0);
if (dev_priv->chipset >= 0x90)
nv_wr32(dev, 0xe074, intr1);
spin_lock(&priv->lock);
list_for_each_entry(gpioh, &priv->handlers, head) {
if (!(ch & (1 << gpioh->gpio->line)))
continue;
if (gpioh->inhibit)
continue;
gpioh->inhibit = true;
queue_work(dev_priv->wq, &gpioh->work);
}
spin_lock(&dev_priv->hpd_state.lock);
dev_priv->hpd_state.hpd0_bits |= hpd0_bits;
dev_priv->hpd_state.hpd1_bits |= hpd1_bits;
spin_unlock(&dev_priv->hpd_state.lock);
queue_work(dev_priv->wq, &dev_priv->hpd_work);
spin_unlock(&priv->lock);
}